import java.util.Scanner;

public class code {
    public static boolean fanc (int[] arr,int num){
        int L = 0;
        int R = arr.length - 1;
        while(L <= R){
            int mie = (L + R) / 2;
            if(num > arr[mie]){
                L = mie + 1;
            }else if(num < arr[mie]){
                R = mie - 1;
            }else if(num == arr[mie]){
                return true;
            }
        }
        return false;

    }
    public static void main(String[] args) {
        int[] arr = {1,2,3,4,5,6,7,8,9,10};
        Scanner scan = new Scanner(System.in);
        int num = scan.nextInt();
       if( fanc(arr,num)){
           System.out.println("找到了");
        }else{
           System.out.println("没找到");
       }
    }
}
